MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix28:F5:37:30:00:00 /28
Vendor addressKoishikawadaikoku Bldg. 3F, 1-3-25 Koishikawa, Bunkyo-ku Tokyo JP 112-0002
Country🇯🇵 Japan
RegisteredApr 30, 2017
Block range28:F5:37:30:00:00– 28:F5:37:3F:FF:FF
Address capacity1,048,576
AdministrationUniversally administered: its prefix comes from a block registered through the IEEE Registration Authority
TransmissionUnicast: addressed to a single device
SourceIEEE Registration Authority
Address capacity is the size of this registered block, not a count of devices actually manufactured or online. Registration identifies the organization holding the block, not a specific device model or unit.
Curious how a prefix like this turns into a full address? See how MAC addresses are structured →
Example addresses in this block
Where this block sits
Previous
28:F5:37:20:00:00 /28
Unicair Communication Tec Co., Ltd.
Next
28:F5:37:40:00:00 /28
Phyn LLC
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
PRIMETECH ENGINEERING CORP. holds 2 registered blocks in the IEEE registry, ranking #2,758 of 33,427 organizations by block count.
Other blocks registered to PRIMETECH ENGINEERING CORP.